Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1998-05-18
2000-08-29
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
310334, 310358, 310367, 310369, H04R 1700, H01L 4108
Patent
active
061118184
ABSTRACT:
An actuator includes a ceramic body having a base and an array of tube-shaped or blade-pair-shaped piezoelectric or electrostrictive ceramic elements defining an enclosure and integral with the base. A first electrode contacts the inner surfaces of walls of the elements, while a second electrode contacts the wall outer surfaces. The actuator is driven for d.sub.31 mode or d.sub.15 mode vibration of the walls. The wall vibration is transmitted to a desired medium via a vibration transmission means, e.g., a compliant polymer filler material of Shore A30 to Shore D75 filling the enclosure and bonded to the walls. Alternatively, a stiff cover plate may be used to transmit the tube wall vibration to a desired medium. An acoustic sensor device is also described.
REFERENCES:
patent: 5173605 (1992-12-01), Hayes et al.
patent: 5598050 (1997-01-01), Bowen et al.
patent: 5841736 (1998-11-01), Bowen et al.
Q. M. Zhang et al., "Piezoelectric Tubes and Tubular Composites for Actuator and Sensor Applications," J. Mat. Sci. 28 (1993) 3962.
Q. M. Zhang et al., "Piezoelectric Tubes and 1-3 Type Tubular Composites as Tunable Actuators and Sensors," SPIE vol. 1916 (1993) 244.
J. Chen et al., "Modeling and Design of 1-3 Tubular Composite for Smart Transducer Applications," Proc. International Conf. Intelligent Mats. (1994).
Bowen Leslie J.
Near Craig D.
Craig Frances P.
Lobo Ian J.
Materials Systems Inc.
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